So Who's Looking After the Kids?

6/13/2008 4:10 PM PDT BY TMZ STAFF

Britney Spears just landed in Sin City -- and guess who's there too? Kevin Federline, who's getting that "Dad of the Year" award, is there tonight. Federleezy is set to host a party tonight at Prive nightclub in Planet Hollywood for all the unwed dads of the world and Britney just got to town to celebrate her own daddy-o Jamie's birthday.